A manual diaphragm valve

Abstract

This application discloses a manual diaphragm valve, relating to the field of valve technology. The manual diaphragm valve of this application includes a valve body, a flow path, a diaphragm, a valve stem, and an actuator seat. The actuator seat includes an inner seat, an outer seat, a seat cavity, a first elastic element, and a padlock groove. In this manual diaphragm valve, the outer seat can effectively move away from the valve stem under the action of the first elastic element, allowing the valve stem to completely disengage from the padlock groove when in the first position. This facilitates the operator in locking the valve stem in the padlock groove and restricts its movement, preventing abnormal valve stem movement due to accidental contact with the outer seat, thereby eliminating abnormal opening of the manual diaphragm valve.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to a manual diaphragm valve. Background Technology

[0002] Modular gas systems, used for gas control in the semiconductor industry, can be designed on a control panel using standard valve blocks, valves, flow meters, filters, pressure sensors, and other components, based on the customer's PID diagram. Among these, the manual diaphragm valve, a core component of the modular gas system, requires exceptional opening and closing stability.

[0003] However, due to the limited installation space of modular gas systems, different components need to be arranged closely together. When operating other components, operators may accidentally touch the manual diaphragm valve, causing it to open or close abnormally, which greatly affects the operational stability of the modular gas system. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this application provides a manual diaphragm valve.

[0005] The manual diaphragm valve provided in this application adopts the following technical solution:

[0006] A manual diaphragm valve includes a valve body, a flow path formed within the valve body, a deformable diaphragm disposed within the valve body for opening or closing the flow path, and a valve stem for pressing the diaphragm. The valve stem is threaded through the valve body along its own axial direction. The manual diaphragm valve further includes an actuator for driving the valve stem to rotate. The actuator includes an inner seat fitted onto the valve stem, an outer seat slidably fitted onto the inner seat along the axial direction of the valve stem, a seat cavity formed between the inner seat and the outer seat, and a valve stem disposed within the seat cavity and extending to both ends. A first elastic element is connected to the outer seat and the inner seat respectively, and a padlock groove is opened through the outer seat at the end away from the inner seat. The padlock groove communicates with the seat cavity and its extension direction is perpendicular to the axial direction of the valve stem. The valve stem has a first position pressing the diaphragm and a second position disengaging from the diaphragm during its rotation. When the valve stem is in the first position, the end of the valve stem away from the diaphragm is accommodated in the seat cavity. When the valve stem is in the second position, the end of the valve stem away from the diaphragm passes through the seat cavity and the padlock groove in sequence.

[0007] By adopting the above technical solution, operators can judge the opening and closing of the diaphragm by the degree of insertion of the valve stem into the padlock groove, thereby achieving effective monitoring of the opening and closing status of the manual diaphragm valve. Simultaneously, the outer seat can effectively move away from the valve stem under the action of the first elastic element, allowing the valve stem to completely disengage from the padlock groove when in the first position. This facilitates the operator in locking the valve stem in the padlock groove and restricts its movement, preventing abnormal valve stem movement due to accidental contact with the outer seat, thus eliminating abnormal opening of the manual diaphragm valve. Furthermore, when the valve stem is in the second position, its end is inserted into the padlock groove, at which point locking is not possible, preventing the manual diaphragm valve from failing to close properly due to accidental locking by the operator, ensuring operational safety and rationality. Moreover, the padlock can be flexibly removed according to specific operational needs without affecting the operator's normal operation.

[0008] Preferably, a locking seat is coaxially disposed on the valve body, and the outer seat is sleeved on the locking seat and can rotate around the circumference of the locking seat. A limiting post is disposed on the side of the locking seat, and a limiting groove is disposed on the side of the outer seat. The extending direction of the limiting groove is consistent with the rotation direction of the outer seat. The limiting post is slidably disposed in the limiting groove. The limiting groove includes a groove body, a first locking groove and a second locking groove disposed at both ends of the groove body. The first locking groove and the second locking groove are both located on the side of the groove body away from the padlock groove and extend along the axial direction of the outer seat. The length of the first locking groove is greater than the length of the second locking groove. When the valve stem is in the first position, the limiting post is accommodated in the first locking groove; when the valve stem is in the second position, the limiting post is accommodated in the second locking groove.

[0009] By adopting the above technical solution, the outer seat can achieve rotational limitation with the cooperation of the limiting post and the limiting groove. When the outer seat is located in the first locking groove and the second locking groove, the outer seat cannot rotate, which further prevents the valve from opening or closing abnormally due to the operator accidentally touching the outer seat. At the same time, when the limiting post is located in the first locking groove, the outer seat can have a larger displacement margin, allowing it to be further away from the valve stem, which further facilitates the operator to lock in the padlock groove.

[0010] Preferably, the locking seat is provided with open and closed markings at intervals around its circumference, and the outer seat body is also provided with an observation port for exposing the open and closed markings. When the valve stem is in the first position, the closed marking is exposed in the observation port; when the valve stem is in the second position, the open marking is exposed in the observation port.

[0011] By adopting the above technical solution, operators can easily observe the opening and closing status of the manual diaphragm valve through the observation port, thereby enabling more effective monitoring of the opening and closing status of the manual diaphragm valve.

[0012] Preferably, the outer seat body has a first receiving groove for accommodating the locking seat at one end facing the valve body, a second receiving groove for accommodating the inner seat body is formed on the bottom surface of the first receiving groove, and a third receiving groove is formed at one end of the inner seat body facing the outer seat body, and the seat cavity is formed between the second receiving groove and the third receiving groove.

[0013] Preferably, the manual diaphragm valve further includes two locking components respectively disposed on both sides of the outer seat. Each locking component includes a locking plate covering the slot of the padlock groove and a locking pin disposed on the locking plate. The two locking pins constituting the two locking components are movable in a direction that moves closer or further away from each other. The two locking pins can be aligned or moved away from each other during movement. The outer seat is also provided with a driving component for driving the two locking pins to be aligned and an unlocking component for driving the two locking pins to move away from each other.

[0014] By adopting the above technical solution, when the valve stem disengages from the padlock slot, the two locking pins can automatically engage and lock the padlock slot under the action of the driving component, eliminating the need for the operator to lock the padlock slot separately, which greatly improves work efficiency; at the same time, the operator can easily unlock the locking component through the unlocking component, avoiding the locking component from affecting the operator's normal operation.

[0015] Preferably, the unlocking component includes an unlocking post that is movable along the direction of approaching or away from the locking post and passes through the groove wall on the side of the padlock groove away from the valve stem, and a second elastic member sleeved on the unlocking post. The two ends of the second elastic member are respectively connected to the end of the unlocking post near the valve stem and the groove wall. The docking position of the two locking posts is located on the moving path of the unlocking post.

[0016] By adopting the above technical solution, the unlocking pin can be inserted into the joint gap between the two locking pins during its movement, which greatly improves the unlocking efficiency.

[0017] Preferably, the two locking pins have a mating portion at their ends that are close to each other, and each mating portion has a first inclined surface on the side near the unlocking pin. The two first inclined surfaces have opposite inclination directions. The unlocking pin has a tapered unlocking portion at the end near the locking pin, and the two sides of the unlocking portion have second inclined surfaces that match the two first inclined surfaces.

[0018] By adopting the above technical solution, the unlocking part can be smoothly inserted between the two docking parts and continuously push the two first inclined surfaces during the movement, making it convenient for the operator to unlock the locking part.

[0019] Preferably, the outer seat body has a handhold at one end, and the two sides of the handhold are recessed inward to form an arc-shaped handhold surface, and the two end slots of the padlock groove are respectively located on the two handhold surfaces.

[0020] By adopting the above technical solution, not only is the operator's finger operation space increased, but the lever arm is also maximized, making it easier for the operator to grip the handpiece and operate the external seat.

[0021] Preferably, the valve body includes a lower valve seat, an upper valve seat disposed on the lower valve seat, and a nut for locking the upper valve seat and the lower valve seat relative to each other. A diaphragm cavity is formed between the upper valve seat and the lower valve seat. The diaphragm is disposed in the diaphragm cavity. The flow path is opened in the lower valve seat and communicates with the diaphragm cavity. A valve cavity is opened in the upper valve seat. A slidable push block is disposed at one end of the valve cavity near the diaphragm. The valve stem is threadedly connected to the valve cavity and connected to the push block.

[0022] In summary, the present invention includes at least one of the following beneficial technical effects:

[0023] 1. Operators can determine the opening and closing of the diaphragm by the degree to which the valve stem is inserted into the padlock groove, thereby enabling effective monitoring of the opening and closing status of the manual diaphragm valve;

[0024] 2. The outer seat can effectively move away from the valve stem under the action of the first elastic element, so that the valve stem can be completely disengaged from the padlock groove when it is in the first position. This makes it easy for the operator to lock the valve stem in the padlock groove and restrict its movement. This prevents the valve stem from moving abnormally due to the operator accidentally touching the outer seat, thereby eliminating the abnormal opening of the manual diaphragm valve.

[0025] 3. When the valve stem is in the second position, its end is inserted into the padlock groove. At this time, the padlock groove cannot be locked, which prevents the manual diaphragm valve from failing to close properly due to abnormal locking by the operator, thus ensuring the safety and rationality of the operation.

[0026] 4. The padlock can be flexibly removed according to specific operational needs, and it will not affect the operator's normal operation. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the manual diaphragm valve in the open state in the embodiments of this application;

[0028] Figure 2This is a front view of the manual diaphragm valve in the open state in the embodiments of this application;

[0029] Figure 3 yes Figure 2 Schematic diagram of section AA in the diagram;

[0030] Figure 4 This is a three-dimensional structural diagram of the manual diaphragm valve in the closed state in the embodiments of this application;

[0031] Figure 5 This is a front view of the manual diaphragm valve in the closed state in the embodiments of this application;

[0032] Figure 6 yes Figure 5 A schematic diagram of the BB section.

[0033] Marked in the attached diagram:

[0034] 1. Valve body; 1a. Lower valve seat; 1b. Upper valve seat; 1c. Nut; 1d. Diaphragm cavity; 1e. Valve cavity; 1f. Push block; 2. Flow path; 3. Diaphragm; 4. Valve stem; 5. Actuator; 5a. Inner seat; 5b. Outer seat; 5c. Seat cavity; 5c1. Second receiving groove; 5c2. Third receiving groove; 5d. First elastic element; 5e. Padlock groove; 5f. First receiving groove; 6. Locking seat; 7. Limiting element 8. Column; 9. Limiting groove; 10. Groove body; 11. First locking groove; 12. Second locking groove; 13. Opening mark; 14. Closing mark; 15. Observation port; 16. Locking component; 17. Locking plate; 18. Locking column; 19. Connecting part; 10. Mounting groove; 11. Driving component; 12. Unlocking component; 13. Unlocking column; 14. Second elastic component; 15. Unlocking part; 16. Handheld part. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-6 The present invention will be described in further detail below.

[0036] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0037] See Figure 1-6 As shown, a manual diaphragm valve is shown, including a valve body 1, a flow path 2 opened in the valve body 1, a deformable diaphragm 3 disposed in the valve body 1 for opening or closing the flow path 2, and a valve stem 4 for pressing the diaphragm 3, the valve stem 4 being threaded through the valve body 1 along its own axial direction.

[0038] Among them, combined Figure 3 and Figure 6 As shown, the valve stem 4 extends vertically. The valve body 1 includes a lower valve seat 1a, an upper valve seat 1b disposed on the lower valve seat 1a, and a nut 1c for locking the upper valve seat 1b and the lower valve seat 1a relative to each other. A diaphragm cavity 1d is formed between the upper valve seat 1b and the lower valve seat 1a. A diaphragm 3 is disposed in the diaphragm cavity 1d. The flow path 2 is opened in the lower valve seat 1a and communicates with the diaphragm cavity 1d. A valve cavity 1e extending vertically is opened in the upper valve seat 1b. A slidable push block 1f is disposed at one end of the valve cavity 1e near the diaphragm 3. The valve stem 4 is threaded into the valve cavity 1e and its lower end is connected to the push block 1f. The rotation of the valve stem 4 drives the push block 1f, causing the push block 1f to press against or disengage from the diaphragm 3, thereby achieving the closure or opening of the flow path 2 by the diaphragm 3.

[0039] In this embodiment, the manual diaphragm valve further includes an actuator 5 for driving the valve stem 4 to rotate. The actuator 5 is located at the upper end of the valve body 1 and includes an inner seat 5a sleeved on the valve stem 4, an outer seat 5b slidably sleeved on the inner seat 5a along the axial direction of the valve stem 4, a seat cavity 5c formed between the inner seat 5a and the outer seat 5b, a first elastic member 5d disposed in the seat cavity 5c and connected at both ends to the outer seat 5b and the inner seat 5a respectively, and a padlock groove 5e extending through the upper end of the outer seat 5b. The first elastic element 5d is a spring. The padlock groove 5e is connected to the seat cavity 5c and extends horizontally. During its rotation, the valve stem 4 has a first position pressing the diaphragm 3 and a second position disengaging from the diaphragm 3. When the valve stem 4 is in the first position, the manual diaphragm valve is in the closed state, and the end of the valve stem 4 away from the diaphragm 3 is housed in the seat cavity 5c. When the valve stem 4 is in the second position, the manual diaphragm valve is in the open state, and the end of the valve stem 4 away from the diaphragm 3 passes through the seat cavity 5c and the padlock groove 5e in sequence.

[0040] In this way, the operator can judge the opening and closing of the diaphragm 3 by the degree of insertion of the valve stem 4 into the padlock groove 5e, thereby achieving effective monitoring of the opening and closing status of the manual diaphragm valve. At the same time, the outer seat 5b can effectively move away from the valve stem 4 under the action of the first elastic element 5d, so that the valve stem 4 can be completely disengaged from the padlock groove 5e when it is in the first position. This allows the operator to lock the valve stem 4 in the padlock groove 5e and restrict its movement, preventing abnormal movement of the valve stem 4 due to accidental contact with the outer seat 5b by the operator, thus eliminating abnormal opening of the manual diaphragm valve. Furthermore, when the valve stem 4 is in the second position, its end is inserted into the padlock groove 5e, at which point the padlock groove 5e cannot be locked, preventing the manual diaphragm valve from failing to close properly due to abnormal locking by the operator, ensuring the safety and rationality of the operation. Moreover, the padlock can be flexibly removed according to specific operational needs without affecting the operator's normal operation.

[0041] In this embodiment, a locking seat 6 is coaxially disposed on the upper end of the valve body 1, and an outer seat 5b is sleeved on the locking seat 6 and can rotate around the circumference of the locking seat 6. Figure 2 and Figure 5 As shown, a limiting post 7 is provided on the side of the locking seat 6, and a limiting groove 8 is provided on the side of the outer seat 5b. The extension direction of the limiting groove 8 is consistent with the rotation direction of the outer seat 5b. The limiting post 7 is slidably inserted into the limiting groove 8. The limiting groove 8 includes a groove body 8a, a first locking groove 8b and a second locking groove 8c provided at both ends of the groove body 8a. The first locking groove 8b and the second locking groove 8c are both located on the lower side of the groove body 8a and extend vertically respectively. The length of the first locking groove 8b is greater than the length of the second locking groove 8c. When the valve stem 4 is in the first position, the limiting post 7 is accommodated in the first locking groove 8b; when the valve stem 4 is in the second position, the limiting post 7 is accommodated in the second locking groove 8c.

[0042] The outer seat 5b can be rotated and limited by the cooperation of the limiting post 7 and the limiting groove 8. When the outer seat 5b is located in the first locking groove 8b and the second locking groove 8c, the outer seat 5b cannot rotate, which further prevents the valve from opening or closing abnormally due to the operator accidentally touching the outer seat 5b. At the same time, when the limiting post 7 is located in the first locking groove 8b, the outer seat 5b can have a larger displacement margin, allowing it to be further away from the valve stem 4, which further facilitates the operator to lock in the padlock groove 5e. When the limiting post 7 is located in the second locking groove 8c, its displacement margin is smaller, and the valve stem 4 can still pass through the padlock groove 5e.

[0043] In this embodiment, combined again Figure 2 and Figure 5 As shown, the upper surface of the locking seat 6 is provided with opening marks 9 and closing marks 10 spaced around its circumference. The outer seat 5b also has an observation port 11 on its side to expose the opening marks 9 and closing marks 10. When the valve stem 4 is in the first position, the closing mark 10 is exposed in the observation port 11; when the valve stem 4 is in the second position, the opening mark 9 is exposed in the observation port 11. Rotating the outer seat 5b causes the valve stem 4 to rotate via the inner seat 5a, placing the valve stem 4 in the first and second positions respectively. During the rotation of the outer seat 5b, the observation port 11 passes through and exposes the opening marks 9 and closing marks 10, allowing the operator to easily observe the opening and closing status of the manual diaphragm valve through the observation port 11, thus enabling more effective monitoring of the manual diaphragm valve's opening and closing status.

[0044] In this embodiment, combined with Figure 3 and Figure 6As shown, the outer seat 5b has a first receiving groove 5f at one end facing the valve body 1 for accommodating the locking seat 6. A second receiving groove 5c1 for accommodating the inner seat 5a is formed on the bottom surface of the first receiving groove 5f. A third receiving groove 5c2 is formed at one end of the inner seat 5a facing the outer seat 5b. The seat cavity 5c is formed between the second receiving groove 5c1 and the third receiving groove 5c2. The outer seat 5b, inner seat 5a, and locking seat 6 are all cylinders. One inner wall of the second receiving groove 5c1 and one outer wall of the inner seat 5a each have a limiting plane. The two limiting planes fit together to prevent relative rotation between the inner seat 5a and the outer seat 5b.

[0045] In this embodiment, the manual diaphragm valve further includes two locking members 12 respectively located on both sides of the outer seat 5b. Each locking member 12 includes a locking plate 12a covering the opening of the padlock groove 5e and a locking pin 12b on the locking plate 12a. The locking pin 12b extends horizontally, and the two locking pins 12b constituting the two locking members 12 are movable in a direction that moves closer or further away from each other. During movement, the two locking pins 12b can be aligned or move away from each other. The outer seat 5b is also provided with a driving member 13 for driving the two locking pins 12b to be aligned and an unlocking member 14 for driving the two locking pins 12b to move away from each other. The locking plate 12a has a mounting groove 12d, and the locking pin 12b is located in the mounting groove 12d. The driving member 13 is a spring whose two ends are respectively connected to the bottom surface of the locking pin 12b and the mounting groove 12d.

[0046] When the valve stem 4 disengages from the padlock slot 5e, the two locking pins 12b automatically engage under the action of the spring and lock the padlock slot 5e, eliminating the need for the operator to lock the padlock slot 5e separately, which greatly improves work efficiency. At the same time, the operator can easily unlock the locking element 12 through the unlocking element 14, avoiding any impact on the operator's normal operation.

[0047] In this embodiment, the unlocking component 14 includes an unlocking post 14a that is movably disposed in the upper side wall of the padlock groove 5e along the vertical direction, and a second elastic member 14b sleeved on the unlocking post 14a. The second elastic member 14b is a spring, and its two ends are respectively connected to the lower end of the unlocking post 14a and the groove wall. The docking position of the two locking posts 12b is located on the moving path of the unlocking post 14a.

[0048] Among them, the two locking pins 12b have a docking part 12c at their close ends. Each docking part 12c has a first inclined surface on its upper side. The two first inclined surfaces have opposite inclination directions and form a V-shaped groove. The unlocking pin 14a has a tapered unlocking part 14c at its end near the locking pin 12b. The unlocking part 14c matches the V-shaped groove. The two sides of the unlocking part 14c have second inclined surfaces that match the two first inclined surfaces.

[0049] In this way, when the locking element 12 needs to be unlocked, the operator only needs to press down the unlocking pin 14a. The unlocking part 14c can smoothly insert downward between the two mating parts 12c and continuously push the two first inclined surfaces during the movement, so that the two locking pins 12b are relatively far apart. At this time, the valve stem 4 can extend into the padlock groove 5e, thereby realizing the change of the manual diaphragm valve from the closed state to the open state. After unlocking is completed, stop pressing the unlocking pin 14a. The unlocking pin 14a can be reset under the action of the second elastic element 14b. At this time, if the valve stem 4 moves away from the padlock groove 5e again, the two locking pins 12b can be mated again and realize the locking of the manual diaphragm valve.

[0050] In this embodiment, combined with Figure 1 and Figure 4 As shown, a handhold 15 is provided at the end of the outer seat 5b. The two sides of the handhold 15 are recessed inward to form arc-shaped handhold surfaces, and the two end slots of the padlock groove 5e are located on the two handhold surfaces respectively. This not only increases the operating space for the operator's fingers, but also ensures the maximization of the lever arm, making it convenient for the operator to pinch the handhold 15 and operate the outer seat 5b.

[0051] The implementation principle of the manual diaphragm valve in this application embodiment is as follows:

[0052] When closing the manual diaphragm valve, pinch the two hand surfaces of the outer seat 5b and press it down to disengage the limiting post 7 from the second locking groove 8c. Then rotate the outer seat 5b to expose the closing mark 10 in the observation port 11. At this time, the valve stem 4 moves down from the second position to the first position under the action of the inner seat 5a and presses the diaphragm 3, closing the manual diaphragm valve. Then release the outer seat 5b, which moves upward under the action of the first elastic element 5d. The limiting post 7 enters the first locking groove 8b, and the two locking posts 12b are aligned and locked in the first position under the action of the spring, so that the manual diaphragm valve can remain in the closed state.

[0053] When opening the manual diaphragm valve, pinch the two hand surfaces of the outer seat 5b and press the unlocking pin 14a. The unlocking pin 14a pushes the two locking pins 12b away from each other. Then press the outer seat 5b downwards to disengage the limiting pin 7 from the first locking groove 8b. Then rotate the outer seat 5b to expose the opening mark 9 in the observation port 11. At this time, the valve stem 4 moves upward from the first position to the second position under the drive of the inner seat 5a. Its lower end disengages from the diaphragm 3 and its upper end inserts between the two locking pins 12b. The manual diaphragm valve opens. Then release the outer seat 5b, and the limiting pin 7 enters the second locking groove 8c.

[0054] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A manual diaphragm valve, comprising a valve body (1), a flow path (2) formed within the valve body (1), a deformable diaphragm (3) disposed within the valve body (1) for opening or closing the flow path (2), and a valve stem (4) for pressing the diaphragm (3), characterized in that: The valve stem (4) is threaded through the valve body (1) along its own axial direction. The manual diaphragm valve also includes an actuator (5) for driving the valve stem (4) to rotate. The actuator (5) includes an inner seat (5a) sleeved on the valve stem (4), an outer seat (5b) slidably sleeved on the inner seat (5a) along the axial direction of the valve stem (4), a seat cavity (5c) formed between the inner seat (5a) and the outer seat (5b), a first elastic member (5d) disposed in the seat cavity (5c) and connected at both ends to the outer seat (5b) and the inner seat (5a) respectively, and a through-hole opened in the outer seat (5a). 5b) A padlock groove (5e) at one end away from the inner seat (5a), the padlock groove (5e) communicating with the seat cavity (5c) and extending in a direction perpendicular to the axial direction of the valve stem (4), the valve stem (4) having a first position pressing the diaphragm (3) and a second position disengaging from the diaphragm (3) during its rotation; when the valve stem (4) is in the first position, the end of the valve stem (4) away from the diaphragm (3) is housed in the seat cavity (5c); when the valve stem (4) is in the second position, the end of the valve stem (4) away from the diaphragm (3) passes through the seat cavity (5c) and the padlock groove (5e) in sequence; The manual diaphragm valve also includes two locking members (12) respectively located on both sides of the outer seat (5b). Each locking member (12) includes a locking plate (12a) covering the opening of the padlock groove (5e) and a locking pin (12b) on the locking plate (12a). The two locking pins (12b) constituting the two locking members (12) are movable in a direction that moves closer or further away from each other. The two locking pins (12b) can be aligned or moved away from each other during movement. The outer seat (5b) is also provided with a driving member (13) for driving the two locking pins (12b) to be aligned and an unlocking member (14) for driving the two locking pins (12b) to move away from each other.

2. A manual diaphragm valve according to claim 1, characterized in that: A locking seat (6) is coaxially arranged on the valve body (1). The outer seat (5b) is sleeved on the locking seat (6) and can rotate around the circumference of the locking seat (6). A limiting post (7) is provided on the side of the locking seat (6), and a limiting groove (8) is provided on the side of the outer seat (5b). The extending direction of the limiting groove (8) is consistent with the rotation direction of the outer seat (5b). The limiting post (7) is slidably inserted into the limiting groove (8). The limiting groove (8) includes a groove body (8a) and first locking grooves (8a) provided at both ends of the groove body (8a). 8b) and the second locking groove (8c), the first locking groove (8b) and the second locking groove (8c) are both located on the side of the groove body (8a) away from the padlock groove (5e) and both extend along the axial direction of the outer seat body (5b). The length of the first locking groove (8b) is greater than the length of the second locking groove (8c). When the valve stem (4) is in the first position, the limiting post (7) is accommodated in the first locking groove (8b); when the valve stem (4) is in the second position, the limiting post (7) is accommodated in the second locking groove (8c).

3. A manual diaphragm valve according to claim 2, characterized in that: The locking seat (6) is provided with an opening mark (9) and a closing mark (10) spaced around its circumference. The outer seat body (5b) is also provided with an observation port (11) for exposing the opening mark (9) and the closing mark (10). When the valve stem (4) is in the first position, the closing mark (10) is exposed in the observation port (11); when the valve stem (4) is in the second position, the opening mark (9) is exposed in the observation port (11).

4. A manual diaphragm valve according to claim 2, characterized in that: The outer seat (5b) has a first receiving groove (5f) for accommodating the locking seat (6) at one end facing the valve body (1), a second receiving groove (5c1) for accommodating the inner seat (5a) is provided on the bottom surface of the first receiving groove (5f), and a third receiving groove (5c2) is provided at one end of the inner seat (5a) facing the outer seat (5b).

5. A manual diaphragm valve according to claim 1, characterized in that: The unlocking component (14) includes an unlocking post (14a) that is movable along the direction of approaching or away from the locking post (12b) and passes through the side wall of the padlock groove (5e) away from the valve stem (4), and a second elastic member (14b) sleeved on the unlocking post (14a). The two ends of the second elastic member (14b) are respectively connected to the end of the unlocking post (14a) near the valve stem (4) and the groove wall. The docking position of the two locking posts (12b) is located on the moving path of the unlocking post (14a).

6. A manual diaphragm valve according to claim 5, characterized in that: The two locking pins (12b) each have a mating part (12c) at their ends close to each other. Each mating part (12c) has a first inclined surface on the side near the unlocking pin (14a). The two first inclined surfaces have opposite inclination directions. The unlocking pin (14a) has a tapered unlocking part (14c) at the end near the locking pin (12b). The unlocking part (14c) has a second inclined surface on each side that matches the two first inclined surfaces.

7. A manual diaphragm valve according to any one of claims 1-4, characterized in that: The outer seat (5b) is provided with a handhold (15) at its end. The two sides of the handhold (15) are recessed inward to form an arc-shaped handhold surface. The two end slots of the padlock groove (5e) are located on the two handhold surfaces respectively.

8. A manual diaphragm valve according to any one of claims 1-4, characterized in that: The valve body (1) includes a lower valve seat (1a), an upper valve seat (1b) disposed on the lower valve seat (1a), and a nut (1c) for locking the upper valve seat (1b) and the lower valve seat (1a) relative to each other. A diaphragm cavity (1d) is formed between the upper valve seat (1b) and the lower valve seat (1a). The diaphragm (3) is disposed in the diaphragm cavity (1d). The flow path (2) is opened in the lower valve seat (1a) and communicates with the diaphragm cavity (1d). A valve cavity (1e) is opened in the upper valve seat (1b). A slidable push block (1f) is provided at one end of the valve cavity (1e) near the diaphragm (3). The valve stem (4) is threadedly connected in the valve cavity (1e) and connected to the push block (1f).

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